I have been using Personal, and I don't like it very much.
The coverage is arguable (but I have never used other carriers) and there are many blind spots even in Capital Federal.
My use is minimal, I just need to receive/send calls from/to my husband and to check my emails when I am not at home, however:
1) Emails are usually delayed 5 to 10 mins
2) Usually my phone picks the headline of the message, but when I click on the notification to open the message, it has to connect again and download the body of the message, which takes 1-2 minutes.
3) I have a subscription very cheap called Juegos, where I have up to 10 MB of 3G internet connection, then I have to ask for another 10 MB for 1,5 pesos. The truth is that it is delayed and quite slow for the first 10 MB, after which it stops. It is painful! I thought 10 MB was enough just to read the body of my emails. However, even WiFi in cafés is pretty slow, so I am not sure if it is my plan/Personal that sucks, or if this is the national trend.